Is being fat sometimes subjective?

I used to know one dude, who constantly picked me on my body and said I'm chubby and need to work out or that I'm thick and look like a fat cow, although most people that know me in real life, say I'm healthy or have a nice shape

I believe it has to do with an individual's personal and cultural preferences, as well as his/her background. Some people will just call fat, anyone with a BMI over 18, who doesn't look like a model
Is being fat sometimes subjective?
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