Put yourself into a long term situation whereby you couldn't stand this person and yet, the person just doesn't know how to control himself/herself and continue to look down on you.
You're giving that person a chance to realise the error(s).
But you will never realise that the chances that you gave was too many beyond what it was supposing to be.
Soon you figured out that you have enough of everything and went berserk.
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When dealing with this kind situation, never take in comments like "ignore him".
I would prefer to handle this kind of situation with telling straight to that person - " i know about it ", "you don't have to keep repeating" , "i know you're experienced, but hey, I think what you're telling me right now are those what i know. Do you mind telling me something enriching or something that is new to me?".
That's how kind i am. If you think I'm trying to be mean here, I'll just take it that you're judging me because you don't understand or know me.
Never try to give back a reply that is similar to that person's attitude. You're just dragging yourself down to that person's dumbness level.
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Getting looked down upon isn't a very bad thing after all. You'll get stronger, you'll want to surpass everyone, but getting too much being looked down upon is just way too much.
Likewise, don't look down on any other person too much. Who knows the next moment you'll be looked down upon twice the time.
Make a wise decision, protect yourself from emotional harm and refrain from harming others.
