This is will always be an issue unless the feature itself is removed. I know some players like it, and some players do not. However, this is a perfect example of how the community makes or breaks a feature. The constant choice to abuse the feature in lieu of using it honestly has lead many players like
@theosarugambit and I having the similar opinion... we just disabled it in our settings. This unfortunately effects the users who use it properly as well.
Little can be done to curb the behavior other than making this a pay-to-use site. There is, unfortunately, a small portion of users on this site that just like to goof off and cause mayhem within the community. This is usually weeded out with having to pay per account. That being said though... I would never want
lichess.org to go to that model. I think the larger chess community would suffer without such amazing free services like this website. I know that I have personally benefited so greatly from this website so I assume many others share my feelings of gratitude and see the benefits first hand of this remaining free and easy to access.
SO it is with that interest in mind that my general practice is to:
1. Go into zen mode before games
2. Disable take backs.
3. On completion of the game, the chat opens and If I want to discuss the match this is when I do so. If i receive hostility here, I simply ignore/block the player and never have to deal with them ever again.
Its up to the community to act and behave appropriately and also to use features the way they are intended to be used if we wan't to have nice things around here. =)