You met already - the event is past.

"I was hoping you would look the same when we met."

You have not met yet. The event is in the future.
"I was hoping you would look the same when we meet."

tostyle unI was hoping you would look the same when we met.

Try to choose all your verbs from the same group unless you are deliberately contrasting times.

Group 1: am, is, are, do, does, have, has, will, can, may, must, and all present-tense forms (take(s), meet(s), see(s),...).
Group

So we haven't met yet so can I say, "I hope you would look the same when we met"

I know I can all say I hope you will look the same when we meet but sometimes people refer it In past tense.

tostyle unSo we haven't met yet so can I say, "I hoped you would look the same when we met"

Correct as shown for the past. (If you're following my grouping method, note that the past tense "hoped" goes with "would" and "met".)

tostyle unI hope you will look the same when we meet.

Thanks!And Mr.CJ I think we normally say "I could have been rude to you but I didn't." But I have also heard people say "i could be rude.", that is definitely correct, right?
Ex:"I would have been with you had you wanted me by your side/ I would be with you."

Instead of saying "of course I would have if you wanted it." How about only saying of "course I would if you wanted it."(I kn

tostyle unI think we normally say "I could have been rude to you but I didn't. wasn't."

been is from be. wasn't is from be. didn't is from do. You have to match verbs.

tostyle unI could be

Hi CJ

I could be rude to you, but I won't. Correct.

Shouldn't it be "wouldn't" instead of "won't"?

Thanks.

tamguatlayI could be rude to you, but I won't. Correct.

Correct. I promise I will not be rude to you right now.

tamguatlayShouldn't it be "wouldn't" instead of "won't"?

It's possible, but native speakers would not say it. It is used this way:

I wouldn't be rude to you even if you insulted my mother.

Mr.CJ, I m very confused right now so please clear it out for me.

Is this also past tense? "I could be rude to you."

Is this present tense or past tense?
"I would stay with you if you told me to stay with you."(I think this is past tense so I said would and told) otherwise I can also say it this way, "I would have stayed had you told me stay with you."

Is this past

"I could be rude to you." - this could also be past tense?