I cannot stand processed cheese like Velveeta and the cheese you get with pretzels and nachos.
That is what is known in the rest of the world as American cheese* (though such a thing is technically different to what America knows as American cheese) and anybody that raises an eyebrow at your not liking it.... well you have just found a quick and easy way to determine someone that has an opinion on food that should not be trusted.
*much like American comics there are some that are very nice cheeses that come from America. However, much like comics, damned if I would suggest someone go in cold and sample various things in an attempt to find something good.
Celery seems to be a popular one. Though I have never found a great use for the stuff and its relative expense to mass it provides means I never seek it I can not really see it being as repulsive as some say.
On the parts per million though... look at bags of nachos and lots of other similar things. You would be surprised how often celery powder is used.
On baked beans. In the UK they are tomato sauce and tomato sauce with something in it (some chilli, BBQ, Branston...), the same but with sub hot dog sausages or worse than that the low salt variety. However they were a very wide variety when I was stateside, some of which were very nice indeed.
Now beans I dislike..... if someone tries to feed me butter beans it is likely to come to blows.
Potato salad and coleslaw. Love the stuff, homemade is typically better though. Lidl do a version with a yoghurt dressing though and I quite like that.