What's wrong with calling a fat bloke a fat bloke? It's his choice to eat the pies.
Because when you do that, you make judgements. Look at the second part of your statement. He may have a medical condition and not be eating all the pies. Also if you want stewards to respect you, then maybe show them a bit of respect to. You can make yourself heard with a complaint about stewards with out having to be derogatory about them