When living in Canada, everyone needs to be particularly careful about whether their behavior or speech might be perceived as "discrimination" or "harassment" of others. Discrimination here is not limited to racial discrimination; it also includes discrimination based on physical characteristics, social class, gender, and more. Below, the Canada Immigration experts provide a few examples:
Fat
Calling someone "fat" is an extremely rude term; even when talking about someone behind their back, this word should not be used. Generally speaking, it is best to avoid it. If it is truly unavoidable, you can use "heavy" as a substitute, for example: "She's a little heavy." By the way, never ask a female classmate about her weight; it is even ruder than asking about her age.
Dangerous Area - Bad Neighborhood
Using the term "bad neighborhood" can imply class discrimination; a more tactful way to say it is "tough neighborhood." I believe everyone understands that in Canada, the more impoverished an area is, the more intense the class struggle can be. Therefore, you should quickly identify which areas in the city where you live are low-income neighborhoods. If you ask Canadians, it is better to use "tough neighborhood" and avoid using "bad neighborhood." Associated with "bad neighborhood" is the term "poor people." A more tactful way to say this is "the people living under welfare." It may be more complex, but it is still worth the effort.
Fit
Believe it or not, if the word "fit" is used incorrectly, it can be considered sexual harassment. First, it should be clear that it is always appropriate to compliment a woman on her nice attire, but how you phrase it matters. Simply saying "nice dress" is sufficient. If a woman—perhaps your student—is wearing something tight-fitting that accentuates her curves, it is certainly pleasing to the eye, but if you say, "The dress fits you very well," it is equivalent to saying that your eyes are wandering. So, if someone is wearing loose clothing, can you use "The dress fits you very well"? Not only should you not, but it is even worse; if you do, it not only suggests your eyes are wandering, but also that you are intentionally mocking her figure for not being curvy.