The only emotion that spreads more reliably is panic.
Contempt is caused by fear and by shame and it looks like disgust. It's very hard to recover once you receive contempt from someone else, and often, our response is to dump it on someone else.
If you want to be respected by your customers/peers/partners/competitors/constituents, the best way is to begin by respecting them and the opportunity they are giving you.
And the best way to avoid contempt is to look for your fear.