My problem with bubble zones is that they're A) difficult to enforce, and B) protesting should be inconvenient. If we only allow protests in certain places, they're extremely easy to ignore. This goes for any kind of protest on any issue.
In an ideal world, I don't really want kids exposed to protests. But protests are only really effective when they take place where you don't want them. If protests for trans rights only ever took place in a cordoned off area safely away from everyone, they wouldn't be very effective either.
Parents should have a say what is being taught to their kids. LGBT values are an invasive culture change that is being pushed on kids without the interests of the parents in mind. This was equally true of the way Christianity was pushed on kids. I have always supported the secularization of schools. I don't want the government teaching my kid what to believe. They should learn fact-based sciences and important life skills, values should be taught by the parents.
For the record, I've been an LGBT supporter all of my life. I've always preached acceptance of other people no matter their beliefs or circumstances. I've only recently had to start pushing back because I believe certain parts of the LGBT culture are not suitable for children. It does not make you evil or a bigot to seek compromise. We all have to live together in this nation, we need to find ways to make peace with each other.