Inconsiderate would be anything that purposefully causes discomfort to those who are not engaged in it. You can absolutely be diapered, wet your diaper, wear a shirt that would be considered nostalgic/childish, and/or perhaps act a little childish if you were with someone who was playing along - and none of this be an issue.
Is your diaper mostly covered and you a wearing it like underwear underneath your pants? Great - no one honestly knows or cares - this is particularly true if it's a medical diaper. Most people aren't looking - and if they see it they'll assume you have a need. If the diaper is very flashy - you'd want to either wear a onesie or a fixation panty to make sure it was covered if you bent down. Generally fresh wetting is pretty neutral in scent - it shouldn't draw attention. Many people wear sesame street shirts who aren't ABDL - most people just see it as a throwback.
You might be talking playfully with a partner or friend who knows you are a little - most people observe that as playful or silly. They might also think you are crazy - but still - not a threat.
Once you start going into the realm of exposure/exhibitionism - you're out of line. Not wearing pants, flashing your diaper, messing your diaper publicly and purposefully exposing people to your dirty work. Incon folk don't go out shouting they wear diapers...it's part of life...it's just a thing. If you can't enjoy it "just being a thing" when you are in public...don't.
Are their semi-public places where some of these things could be acceptable? Sure. Costume party, raves, kink events, private cabin where you can be outside but there's no one for miles. (most, if not all preclude you from messing your pants...and truthfully...there are very few places outside of your own home and/or with a caretaker where doing this isn't a burden to anyone around) And if you're the only one having fun...that should raise questions for you. Getting your jollies off should not be at the expense of others.
I wear most places - but I also take strides to be "invisible." I wear a fixation pant or onesie to avoid anything being seen when I bend over. I dress in layers, I change before I can leak, I clean myself with wipes, dispose of my diapers discreetly so that even those taking the garbage out are unaware. The "thrill" is in just being diapered at all - and especially as a working adult. The "secret" of it is fun but it also takes a lot of anxiety way just being diapered. I don't want to lose that freedom or make someone else uncomfortable by it.
Do I sometimes wish I could just be a toddler? Sure. And there are contexts where that can happen without it being an issue or exposing people - but they are unique, usually planned, and limited in scope for attendance. While there are times where it would seem fun to be "out there" it is not courteous or kind. It is not good professionally or personally. If you do not feel you can restrain yourself from doing this publically - and therefore bringing shame on the community - I beg of you to seek help to find out why and hopefully find balance.
