We avoid nothing at all, I think people who make rules about where they will and won't eat on holiday misunderstand what a holiday is about
We will definitely have a full English breakfast on holiday, a decent Indian one night (if there is one, obviously we never have on holiday in Calis/Fethiye) a decent Chinese and who knows, even fish and chips. We'll have plenty of local food too. We don't often go to McDonalds or Burger King here so there is no great call to go when on holiday for a week. I certainly wouldn't have any problems going though.
It is a very British thing, pointing the finger at our fellow country folk who travel abroad and want pie and mash. Italian restaurants in my birthplace of Bedfordshire are full of Italians and nobody thinks "why don't they put the pasta behind them and go embrace their adopted culture with a Shepherd's Pie".
You're on holiday, eat what you like, where you like. God help anyone who goes on holiday for a fortnight and has to have 14 lunches and 14 dinners all from the country they happen to be in.