The internet is feminine dominant by default isn't it? You can never present yourself on the internet in a directly masculine way. Masculinity can only be expressed indirectly.
The feminine wins out on the internet because it naturally identifies strength in the many, in community, in social cohesion. Already by logging on you are conceding masculine terrain I think.
People who are "being good" on the internet act on their tendency to identify the good as the ideas that foster safety and cohesion within an imagined community. Things like courage or individuality aren't important.
People who have a natural distaste for those who are "being good" on the internet think that this is an unfortunate levelling out of virtue. That it shouldn't be that easy to be good. That the real goodness should be reserved for those who sacrifice themselves, who show strength in individuality, belief in their own reasoning and courage to stand up to the masses.
But the discursive playing field of platforms like Twitter skew against this I think. It is easy to leverage the wheight of "common sense" against the individual standing out from the masses. It is easy to deflate the masculine ideal.
I'm not saying oh how terrible this all is! But it's crucial to the emasculation thing.