Everyone can cast a vote to kick someone from the raid, no reason is needed, many do it for trolling or they are just noobs.
It is fine to kick some players from RF otherwise most of them would join and go AFK, however when kicking, the player who wants to kick another player should say the motivation, make a pop-up where you put the motivation, and the players who the kicking votes has been casted on should be able to see the name of the player who casted the vote.
Also the players should stop to click kick without even knowing the reason.
I have seen some RF with massive kicking votes to the point the RF lost so many players it failed. Now to fail a RF means to be a real sucker in this game. Regards.