I think you are contradicting yourself. You say "being honest" and "nothing bad", lol. To me, anyone who uses the "just being honest" excuse knows full well it was probably filled with innuendo, callous remarks, or negative comments.
cerb is for good recommendations only; it is completely up front about it, and does not tolerate anything else. Why people insist on feeling picked on or treated unfairly when they continue to violate the policies of a board they wanted to join is pretty strange.
Tell your friend to read the rules, and let you know what he did wrong. If he reads them and still doesn't understand, then cerb is definitely not the right place for him lol. btw, cerb now has a Survivor style banning policy. When people get banned these days, it is because they have been voted off by the long time members lol. You can complain about mod, are you ready to complain about everyone who agrees with him too?