I witnessed the whole scene yesterday, although I will say nothing about it to avoid getting involved.
Edit: Ok, I will give my side of the story anyways, since i guess saying nothing would be like spamming.
A few minutes after I joined, I saw clean get slayed, but I didn't look too closely into it. Then afterwards, I speced clean and I saw him at the top of the garage window (one where t's usually camp) with a bunch of other rushing ct's. Imserious and several T's came out of garage and clean turned around and shot at them. He killed them, but afterwards he was slayed and an admin message saying "Dont f*cking camp clean" came up. One guy said something to the extent of "Admin must be having a bad day" and was kicked. Afterwards there was no message from admin until clean was in the far office and shooting at the t's that were rushing out. He was then slayed and banned.
Now i didnt see any sniper room camping, but clean sometimes did do stuff that was borderline camping, like camping in the garage (on dumpster), for which he was slayed several times.
I was not there, but camping on the dumpster in garage if Ts rush garage is not a bannable offense. Tons of people, including BoSS members/admins do that. If I'm dead, and I see someone on CT camping there, I wait until no Ts are coming out of the back office, and then I send the sparks!
However, I do frequently play with serious on the servers and he's never banned anyone without reason while I was there.
The objective of CS_ maps implies that the CTs rush and the Ts camp to fend them off. However, sometimes the Ts rush instead. When this happens, CTs should be allowed to camp in garage to fend them off, as long as they continue to their hostages after all visible Ts have died.
Mr. Clean, sniper rooms are grounds for slaying without warning. You played on the servers for a while, you should have known the rule.
Also, nobody should disrespect an admin. The result is unpleasant. Trust me, back talking an admin can get you kicked, banned, etc...