It’s not disrespectful to a person to take a ramp instead of the stairs, but it is disrespectful to not learn someone’s name — if you have dysnomia, I’m sure you’ve had people be unreasonably offended and you’ve had to explain that for you it’s a matter of ability/lack thereof vs respect/lack thereof.

Not remembering someone’s pronouns is only more of the same concept, and with how often non-binary folk are misgendered, if you explain that you have dysnomia they’ll ‘get it’ way better than how people who don’t deal with being misaddressed day in and day out deal with someone who can’t learn their name.

Until society treats everyone equally we’re all going to need to make concessions here and there to help others. In this case, it means those of us who can should learn new pronouns. And for those with dysnomia it might mean a tad more awkwardness — but remember, these people are going so far as to buy buttons to wear on their chest to help others learn to address them properly.

We’re in a transition phase, there are some speed bumps. We might have to slow or alter our route. But it doesn’t mean we should stop the car.