Buying pizza from a shop that serves pork

I live in a non islamic country where I have a friend who has a pizza shop. In that shop they make pizza with pork as well as other meat (chicken and lamb). Some people said its not allowed for us Muslims to buy or eat from that shop but my friend who has that shop says that we can eat pizza from that shop because they prepare and cook pork pizza separately. They said we have separate dishes and all the staff which are needed for the pork pizza. Bisically same shop but separate tools. Now my question is, Islamicly can we eat or buy pizza from that shop? Does it come under halaal or haraam pizza? Sometimes when we go to their home they order pizza from their shop for us, are we allowed to eat that pizza? If not then how can we avoid eating that pizza without hurting their feelings? Please help.