I take exception to that - Tradução em português

Please friends,
I know we shouldnt translate everything, and in fact I do not quite mean that. But, I need at least remember what we use in portuguese in the followed case:

"I take exception to that".

Also, may I use put off as: repelido. Example: "... to show that mosquitos are attracted to, or put off by, certain smells."

Thx a lot