It shouldn't matter whether or not someone has an allergy to the bubbles---it's common courtesy to not get your crud on other people.
That we have to say-----at all-----that blowing bubbles in a small space (or spraying a mister fan or those fake perfume sprays, or smoking outside of a smoking area, or leaving your trash all over the ground or chewing gum on the handrails, or any other number of behaviors that affect others around you) is rude shows exactly how lax our society has become.
DH and I have a saying we use with our kids. "you do the right thing--you set the example."
The right thing may be letting someone ahead of you in line, if you have a cartful of things and they have a box of cold medicine and look like death.
The right thing may be stopping a young child from running out the door of a store without a parent behind them.
The right thing may be picking up the candy wrapper someone else dropped and throw it away.
The right thing may be as simple as walking away from a confrontation.
Sometimes the right thing may not be the right thing for you, but it's the right thing for everyone else. So you do the right thing, and you deal with your

later.
Maybe if everyone on the DIS (funny---those are the initials of my son's school

) would "do the right thing" for everyone else, it might make the World (and the world

) a bit better.