1. 不要班门弄斧, 这样只会丢自己脸
   Translation: Don't disply one's slight skill before an expert, you'll only embarrass yourself.
2. 进墨者黑,进朱者赤
   Translation: Too long, check it up yourself -.-
3. 忘恩负义
   Translation: Ungrateful
4. 做你的白日梦
   Translation: Indulge in wishful thinking

These 4 phrases suit you flawlessly. Execpt for No. 2. Nuff' said, wont blog bout it here.