The word “yep” is not necessarily rude but some people do consider it rude in formal situations. “Yep” can sound rude if it is said in a dismissive tone.
Is yep rude?
“Yep” by itself is not rude to use in English. It is a very common alternative to “Yes”.
Do you want to go to the cinema?
“Yep” can be rude depending on the context and tone of your voice so you do need to be careful when you are speaking.
“Yep” can be used in a way that sounds curt. This means that you will sound disinterested in what the other person is saying.
Do you wanna go out later?
Yep is even more informal than yeah so you need to use “yep” in the right situation.
Is yep unprofessional?
“Yep” can seem unprofessional and I would only use it at work with people I know well. If you have a more informal relationship with someone, then it is acceptable to use but if you have a formal relationship with someone then I would avoid it.
Can you use Yep for Yes?
You can use “yep” in place of “yes” in some situations but you need to understand that “yep” is more informal than “yes”.
If you are writing a formal email, it is better to use “yes”.
Yes, I have looked at the report and I will send it to you later.
It is perfectly acceptable to use “yep” in other work contexts that are less formal.
Do you want to go for a beer after work?
Yep, Let’s do it!