See, there's a simple explanation to this, besides PJZ's (in my opinion) apt description of a few wanderers that like to stir the pot.  All is civil and peaceful in the rendo posting world, as long as you do not:

Claim V4 looks like crap

Post 45 Images of a poser female with unrealistically huge basketball boobs (and name it something grandeos like, "She walks with wind in her hair holding the earth in her palm and all is well".)

Claim poser isn't art. (or claim its easy, instant or the "cheaters way" to do art).

Claim you are a professional expert extrordinaire in poser when your on your fifth all time render and tell everyone else they are doing it wrong.

Start asking how to get comission work when you just bought your first copy of poser five minutes ago and havent downloaded it yet.

get on the thumbnail TOS issue.

avoid those, and it will be all smooth for you :)