Firstly the person at your friends house seems really rude as someone with a stutter I completely understand the anxiety you may feel. I always let the person know I stutter before I answer any questions if I feel like I'm going to stutter I just let them know when I'm more relaxed I'll answer them. I think it depends on what works for you. I do sometimes use my notes on my phone to write down if I'm feeling extremely anxious. It's hard to not to feel insecure but just try your best to breath through the words it can help. If you can get any support from friends or family let them know how they can support you in times when your stammer gets really bad. Hope this helps