Amourshipping is probably the closest we got in terms of an actual romance sub-plot involving the main protagonist, Ash so it's only natural that it gets attacked by rivaled ships. Even way back in 2013 when Serena was introduced as someone with a backstory with Ash, it sent a disturbance to other rival ships.
Anyway, it's not like shipping wars are exclusive to anipoke. You also get this in pretty much every other anime out there but since Pokemon is still ongoing (or at least, Ash's journey is), the debate on shipping wars will not end. At the very least, we only have few more episodes to watch before we see which ship will come on top. I'm still inclined to beleave that a neutral ending will happen but we'll soon find out.
p.s. I'd sugest to stop looking at twitter posts and treat it like a holy bible or something, especially if you cannot handle one person's opinion there. If you want to have some good vibes though, I'd recommend that you check some amourshipping fanarts instead. There's plenty of good fanarts out there and there's always something new and people seem to be more civilized in twitter when it comes to those stuff.
Lastly, I just want to end my post by saying just because amourshipping is getting bombarded doesn't mean that majority of the fans have abandoned ship. Most of us just chose not to say anything but the support is always there. You have to understand that in the vast sea of twitter, there will always be the vocal minority but it doesn't mean that something is already "contreversial" and thus why you should not take any opinions in twitter so seriously, especially if just one post there already makes you feel insecure.