Also isn't it on every server that all DLCs are in the required box? Since the APEX weapons and vehicles can exist without interfering with non-APEX players. So basically Lex your point is invalid in this situation.

In T120845#1523529, @Lex wrote:

Before an entrance on the server, you don't see what are necessary to DLC or MOD ?
http://imgur.com/a/JSCJK

The least someone could do is create a specific error that tells the people getting kicked they need the DLC to see specific assets. Otherwise as centrifugal said they'll never know and keep verifying their game in hopes it might work or think it's some kind of bug and just give up. Although I don't think putting minimal effort into this problem is going to make anyone happy.