Others have given you solid answers on why the chicken and watermelon thing was really stupid so I’ll try to answer from the Irish perspective on the second part of your question:

You can serve me corned beef and cabbage on St. Patrick’s day as long as you’re not being a dick about it. I’d probably consider it a nice effort actually if I happened to be abroad on the day.

My dad used to love corned beef, cabbage and potatoes with parsley sauce. It’s a grand meal but not my thing.

If you were a unionist who served it to me in a leprechaun outfit I’d be inclined to tell you where to go though.