All I can add is this: ignore the fools making asses out of themselves about this. This attitude isn't new, and we've seen his with other media, mediums, and genres. Promote positive interactions with fans or fandoms the best you can. At the same time, don't waste too much time on people who refuse to change, or act like constant assholes with nothing better to do in life.
I admit I don't interact much with the anime community anymore, but it had nothing to do with anime going mainstream. Most anime I am not interested in, and funny enough, even during the big flood gates of the late 90s and early 2000s, I only watched what interested me. I did watch a lot of anime, but at the same time, there are plenty of anime I either chose not to watch, or I didn't have the means to watch them. Outside of pirate/free streaming sites.
The last new anime I watched to completion and enjoyed are New Panty & Stocking in 2025, and Ninja Kamui in 2024. Both gave me exactly what I wanted for different reasons. Ninja Kamui especially I love, because it's a early 2000s action anime throwback I dig the hell out of, and respect it. As you get older, you learn that you're not always going to be interested in "everything" nor "what everybody is doing it or watching it". I am more than satisfied I learned that the easy way in anime, and gaming especially.