If it is especially vulgar or profane, I believe the best action is a screenshot or two
(Windows key + "Print screen" on a PC - the picture should then appear in the pictures file under screenshots)
Send it in to the customer support, they usually have dedicated abuse@ email addresses for this... rooms will then mute or ban these people.
It used to be a huge problem in the early days of
online poker. Now thankfully not so much, thanks to cracking down on this by the rooms and the players reporting them.
But there are always newbies that think they can get away with it.
So do everyone down the line a favor and report them.
You could be saving someone especially vulnerable from being tormented.
Imagine your mom playing a game of poker. If it's something you wouldn't want her reading then report it.
My 2 cents...
Cheers.