One of your group members gives you a death stare every time you make a suggestion. This is an example of... Effective communication?

Constructive criticism?

Intimidation?

Verbal harassment?

It would be Intimidation. Hope this helps!

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.