|Not this type of bat, source.|
If you have to deal with intrigued Baby Bats on a regular basis you may find one or two may annoying but the majority are misinformed, they don't have the knowledge to get better clothing so don't openly judge them when you aren't aware of their situation. Don't freak out when they approach you because they're probably just excited to have met another Goth, I've encountered several people like this and though it was frustrating to be interrupted and talk with a complete stranger it was always nice to meet someone as enthusiastic about the subculture as I was, if less knowledgeable. If you're impolite you're enabling them to continue being something you despise in response. They're not going to brush against your delicate clothing and suddenly make it look like a blanket of cheap misguidance.
If a person is educated about the subculture but acts condescending to people who approach them in positive interest, who comes off worse here? I cringe at badly applied "gothic" make up as much as the next person but it's much easier to just ignore it, unless they ask outright for advice don't ruin their day by correcting them about "tr00" Goths. You'll appear elitist and close-minded, Goths already have a stereotype of turning noses up at others so please don't feed this misinformed rubbish.
And if they actually do ask for advise? There are ways to explain Goth without making them feel bad, that is to say if you have the time. Direct them to local communities so they can connect with other Goths and mention music to spark their interest. If you're afraid your critique could be taken offensively just nod and make pleasant chat then move on, don't feel like you have to take them under your wing. If they seriously want to get into the subculture they will eventually find guidance and gain a better understanding of the subculture on their own, after all I did and plenty of other Goths did. I believe everyone needs to discover their true style for themselves and usually do without a conversation from a stranger.
However some Baby Bats won't take kind advise well, whose who stomp their special feet and insist that Evanescence IS Goth aren't worth it if they can't respond to logic and better resources. Act like the more mature person in this suitation, just shrug and take a mental note not to try help them again.
To put it simply, I would hope that a Goth would educate others instead of appearing elitist things. I hope that newbies will meet people in the community who would give them tips or just converse nicely with them even if they are smothered in black lipstick and rather visible dye roots.