Would you be mad?

DH and I are in a disagreement over the following situation. I think its rude and appalling, he is ok with it. Here we go:

Friends of his called Friday night and said they were going to stop over in a little bit. This was 6:15. They decide to show up at 8:45 w/ their two little kids in tow. As the son is walking up my stairs he hands me cookie dough and says 'can you make this for us'. I spent the next hour baking cookies for the kids while the wife sat there looking through catalogs.

First off, I feel like if you are going to stop over don't expect me to bake for your kids. Bring something already made, especially that late at night. I was FUMING.

DH said they are his friends and we go there and hang out so its ok. I disagree - I never show up with anything that needs to be cooked or demand they do anything for me. I like this couple a lot but lately a lot of things they do really tick me off and I need to distance myself from them b/c they are DH's really close friends and I'm trying to respect that friendship.

I can't say anything to them b/c they will take it the wrong way........what do I do to prevent this from happening? This isn't too bad - they have actually done worse but I've lost my patience.

Thanks for letting me vent.