That sounds like you are abusing the kick feature. Let them have wrong gear what does it matter to you as long as they are not that undergeared and you get through the content. It's not your job to tell them what to wear. Geez some people really have a problem with others doing things not their way. If they don't want to take your advice leave them be, it's not that hard. If they are rude or really drag the party down than it's okay to kick everything else is kinda toxic.