I don't have any voice chat experiences, but…
Playing Runescape in like 2010. Encountered some guy who insisted on taking some other player on a "date". In Runescape. If any other player got within a certain distance of this "date" he would act like a hardass, trashtalk and then demand to PvP to defend his lady's honor.
>Anarchy Online, hanging out in Rome Blue
>someone in general chat won't stop talking about how she's a gurl on the internet tee hee
>express doubt
>"she" gets offended
>explain that I wasn't trying to be rude but most of the time people who won't stop talking about their vaginas online are actually dudes
>"she" is still offended because no one would pretend to be a girl online
>say that her inability to listen to reason has actually convinced me she is a girl, then leave to do some missions
>45 minutes later, come back
>huge argument in general chat
>someone asks a random gameplay question which I answer
>girl immediately capslocks, "THATS HIM, HES THE ONE WHO STARTED THIS"
>apparently she summoned her boyfriend after I left and they started some huge internet fight about misogyny for nearly an hour and she's been crying irl the whole time
>boyfriend starts trashtalking but suppression gas is 100% so really he can't do anything but whine at me
>on the way to sell my loot I encounter both of them
>they both have female avatars with matching armor
This was pre-2014 so I doubt either of them was a tranny