Most online anarchists aren't anarchists at all. They neither read anarchist theory, do anything IRL, nor adhere to basic anarchist principals - because they don't know what they are, they just know memes and a skimming of Kropotkin. They also define themselves through a liberal-filtered understanding if what they are not, rather than who they are and what they are working towards.
If you do organizing work IRL you will meet actual anarchists and they are much cooler as they are not just LARPing liberals that happened upon an aesthetic that lets them pretend to be radical while acting virtually perfectly in line with the status quo.
Funny enough, the highest concentration of actual anarchists I've seen is on hexbear, a place another commenter said would be offputting to anarchists. Perhaps they are thinking of the "anarchists" that just watch YouTube videos to get angry at "the tankies" based on a misunderstanding of history in the 1920s and never saw a NATO putsch they couldn't defend.