Eating at people's houses

Is it just me? I hate eating at other people's houses. It's like the same food tastes so different and icky there. For example, I have this staple sandwich with very precise things that I make almost everyday. Cue to a few days earlier and I'm at my grandma's house. I know there will probably only be meat dishes and meat genuinely is my biggest ick, so I take all the things I need (boiled eggs (only way I can eat eggs), tomato (from my house specifically), pickled jalepeno, even the two sauces in their packaging from my house). The only thing I use from there is the bread (same brand of bread I use at home).

And this has happened multiple times but it just tasted OFF. Maybe it's the air in everyone else's house vs mine. But if the same food made anywhere else, and I won't want to eat it. It's like the flavours are sucked out a bit and the textures become weird whenever I eat the same things that I like eating at someone else's house. I don't know how that works, but does someone else get this? It makes family gatherings or just meeting with friends so hard.