As others have said, being able to fix a flat is just about mandatory for anyone who rides more than a few miles from home. It's easy and many bike shops, including most REI stores offer courses from time to time.

Aligning a wheel isn't part of fixing a flat, but if the wheel wasn't rubbing before, odds are it didn't suddenly get that way. The shop probably failed to check the exact wheel position when installing it (with horizontal dropouts). If you have vertical dropouts the shop might have not pocketed the wheel fully into the dropouts (a common error among mechanics who install wheels with the bike elevated) or bumped the brakes, or with canti's moved the yoke carrier which moves the brakes over.

It's also possible that the prior mechanic didn't pocket the wheel correctly, and set the brakes to match the wheel position, so when the wheel was correctly seated it rubbed.

Either way, if the wheel didn't rub before, and is aligned decently enough to clear the brakes (up to 2-3mm wobble) then it is the mechanic job to restore it to the non-rubbing condition. This isn't a wheel alignment, just a proper install. BTW- as any pro mechanic will tell you, they'll often correctly install the wheel and find the brakes now rub. This is a fact of life, and all that I know will do a quick brake adjust for free because they have to rather than return a bike in non-working condition.