He didn't bring the Hulk into it. There is a fine line to walk legally, but making your awning green isn't the same as putting the Hulk outside. He may very well be hinting at the Hulk by the use of that color, but it won't stand up in court.
I personally would never judge a man by any war he might be having with his siblings. None of us here have any clue what a real asshole Lou's brother might be. I do know that once large sums of money are introduced, family ties either get stronger or significantly weaker. It is usually about that time that you suddenly find out you have 50 brand new lost cousins that you never knew before.