Being picky about unimportant details and making other people miserable as a result of your own pecadillos: Edition: My wedding.
Major fight ensued. She also had a particular style in mind for my gown that was not going to happen. So another fight ensued, "But that's the only REAL wedding gown style!" Yaddayaddayadda. I went to Another Store and bought the gown I wanted, mostly with my own money. Cue my mother's negative comments for MONTHS about, "I can't believe you didn't go to Borgias! I got my mother of the bride gown there! What will people think if you don't get your gown there?" To which at one point, I retorted, "That YOU are cheap?"
I guess the guests at my wedding were all just appalled that the dress my mom wore as her MOB dress was a dress that belonged to me.
Off topic but this amuses me the whole idea that everyone actually cares where someone got their dress or that they are designer. I remember watching one of those help people out of debt shows that had a woman on who was adament that she needed to buy designer purses that she didn't like non designer ones and everyone would know that they we're knock offs. So they tested her by showing her an assortment of purses and asking which were designer and which weren't. She couldn't tell, just by looking.
I'm not saying it's bad to like designer things (or expensive things) just trying to justify wanting them by what others think or what you assume others think. Buy it because you love it. Or like it no matter where you got it or who made it.
Along that line, I have a mother-daughter team in my family who are both obsessed with labels and prices.
Example 1: Daughter is getting married 30+ years ago. Very unusually for the time/place, she registers at the only place you could register -- a jewelry store -- for china. It was also very unusual for their family/friends to even own china. In any case the price per place setting was $65. This was at a time when minimum wage in the US was $2, so $65 would have been nearly a week's wages for many people. In other words -- very expensive. The mother and daughter were quite disappointed that a month before the wedding, only 2 place settings had been purchased. They were broadly hinting that I should buy a setting, but I explained to them that I was making minimum wage and wasn't blowing nearly a week's wages on a wedding gift. Too bad, so sad. I was visiting them one Sunday and reading the Sunday paper and to my astonishment, saw that at a local discount/odd lot store, they were selling that same place setting for $20. I immediately jumped up, grabbed my purse and announced to the mother that I was off to buy the wedding gift! Yeah! But... not so fast. Mother actually grabs my arm and starts yelling at me for being cheap and foisting a "knock-off" on her daughter. I pointed out that this odd lot store has the real deal, not knock offs and that it's not cheap to buy something at a great price, it's good sense. She totally freaks out and says that if I "won't spend the RIGHT amount on the gift, then don't give it at all, because your cheapness will taint it forever. My daughter won't even eat off of plates you got on sale." So I didn't buy the setting. They ended up only getting 2 place settings.
Example 2: Many years later, the mother of the mother in this duo asked for a certain lamp for Xmas. (So the grandmother of the daughter in the duo.) She mentioned that she had seen it at Store A. The SIL of the daughter is asked to go in on the lamp as it's expensive. SIL goes out to buy the lamp and realizes she's seen it at the same discount/odd-lot store as in Example 1, for 25% of the original price. She goes back to the other store and buys it, telling the mother-daughter duo of the great deal, (foolishly) expecting them to be happy to have saved 75%. Mother-daughter duo explodes at her, tells her she's cheap and wails that, "What will people think of us for buying a gift at a discount?"