“IMO” stands for “In My Opinion” in text slang. It’s commonly used to indicate that what is being said is a personal viewpoint, rather than a statement of fact.
Example: “IMO, pizza is the best food ever.”
Using “IMO” is not rude on its own. However, tone and context matter. If someone says “IMO” in a dismissive or condescending way, it could come across as rude, but that depends on how the message is framed. For instance, “IMO, you’re wrong” could be perceived as less polite than simply saying “I think you’re wrong.” So, while “IMO” itself is neutral, it’s important to consider the surrounding language and tone.