Yes, I think that unfortunately they're making it clear that inclusiveness is a lower priority than convenience, which is pretty lousy.
This cuts both ways, though. It could just as easily be said that the OP is prioritizing her own convenience over the established habits of all of her friends. The OP can receive texts, so she could compromise by checking them at set times and then calling or emailing her friends when she needs to communicate with them. I would have a hard time remembering specifically which friend of mine never checked Facebook messages (that's my friends' general method of communication) every time I wanted to do something with them.
It would be nice if they went out of their way to use different methods of communication, but it's not on them to accommodate the OP. In most things, the person who chooses to do things differently from everyone else is usually the one who needs to do what is necessary to get along in that group.
I agree. There are a ton of different methods of communication in this world. It's really not rude to prefer one method over another and use it primarily or even exclusively. But you only get to control your own behavior. If you choose to only communicate through text, then some people you might have liked to join in your activity may not make it. If you choose to refuse to ever check texts, you may miss activities. It's not really rudeness. It's just life.
I'm a moderate texter. I have 200/month (received text count against the limit as well as sent), and almost never go over. I've racked up less than $5 worth of overages in the last 5 years, most from the two major moves I had. I prefer a phone call or email for most things. But I know texting is easier for many other people, and since friendship is a two-way street I tend to compromise on communication. I'll receive and read texts as they come in and try to respond within a reasonable amount of time. If I can give a short answer, I'll reply by text. But if it's a long answer I may call or email. My friends, because they are my friends, are happy to live with this compromise, even though some of them really hate the phone or dislike checking to email on the weekends.
In the OPs case there is no budget issue - because the texts she receives are free and she can reply through other means. In fact, since there is a per minute charge for phone calls, the friends are saving her money by texting her.
But if there is a budget issue, I still don't think the friends are being rude. Just like it wouldn't be rude for my friends to organize a night a pricey 5star restaurant even though I can't afford it on my budget.