Sure, I do think that's a reasonable difference in opinion and I agree that it's mostly fine for someone to dislike the way that a language is changing. I think the trouble comes in when that dislike is framed as though it comes from some position of authority or superior fluency, since it's actually an emotional argument, not a logical argument.
Your feelings about English are valid and meaningful, but only to the exact same degree that my feelings about English are valid and meaningful. Telling someone that you don't like the way they're speaking is often rude, but it's not false, because you are the authority on your own feelings. Telling someone that they're speaking incorrectly is usually "not even wrong", because it's framed as a logical argument but it has no logical basis.