It's easy to say but not that easy to implement, many won't give you the chance to explain it. Moreover, it's always difficult to change people's perception about things they have different believe on.
you mean they will just walk away right after you talk bitcon stuffs to them ? but why . that will only make them bad if they wont listen on you. why can they just listen first and make an excuse if ever they arent comfortable of what your talking about . that would be acceptable then.
So, instead of trying hard to convince them, try to make them see the advantages in it. Let them understand the whole concept themselves.
that is imposible to happen if the person dont show any interest right from the start. that is why people make effort to encourage others in the form of easy to understand words so that those people can understand bitcoin is a not confusive way