well the adage of another persons trash being another persons treasure comes to mind
personally I try to keep my personal likes or dislikes to myself since other peoples tanks are their tanks and I would rather encourage people with a passion for fish keeping regardless of whether I like their choice of fish or not
imho
for example I HATE GOLDFISH but take a look at this photo
now forget that she is my daughter and just look at her as a fish keeper who has gotten their very first fish that is all their own, who am I to downplay it with my thoughts of this fish
I think to downplay other peoples fish and tanks does a great diservice to the hobby and could very well discourage people and make them drop from the hobby.