This happens to me all the time, as well as similar situations where another driver has the right of way but yields to be polite to me.
The law in my state is that cyclists must obey all traffic laws the same as cars. If cyclists and drivers alike would accept the right of way when it’s theirs and yield it when it’s not, there would be very few conflicts.
While I appreciate someone noticing me on the road and trying to be kind, what I really need is for them to follow the law and expect me to do the same. This is the safest way.