MRAs existed before third wave feminism and only became widely known after being attacked by said wave of feminism. It absolutely did push to the top a bunch of edgy and shitty people that somehow became popular because people found comfort in someone trash talking horrible people calling themselves feminist. Said people have fallen off dramatically and are now seen as more vile than they once were because the worst of the feminist movement has essentially moved on to actually defending women against the modern day ‘manosphere’ which is overwhelmingly misogynistic and uses men’s issues as a shield from critique rather than treating it as an important issue.
Third wave feminism was the embodiment of ‘Women have very pressing and real struggles, however you can’t solve those problems by hating men’ and I’d wager the feelings you have towards the misogynistic manosphere are the same many of us had towards third wave feminism.