I don't know if this has happened to anyone else, but it seems like 99% of the time that I talk in chat, I get kicked for 'spamming'. I don't really think saying 'trade accept' or 'help how do I blah blah blah' should reciprocate a kick from the lobby. It is very annoying and is ruining my in-chat experiences. Thank You, Trolly321
This is a known issue with Minecraft version 1.13. It is highly recommended to use 1.9-1.12.2 while playing. I hope this helped you and please do respond here if you need additional help.
The staff is well aware of that bug and are working to fix it. This is a necropost, hope this helped.