normal for bettas is realative, one betta can be as different as night and day from another on some things..... most fish have a display posturing and the betta's are well known for theirs... aside from that... one my wife had would dance or at least move rythmically to music, he was a fiesty one that flared more than not
the one I have now is as mellow as they get. I think I have seen him only think about flaring once or twice in the 6 months I have had him. and that was mostly about figguring out the relationship with my angel... once I held a mirror up to the tank, he looked at it and then payed me attention over the mirror. anything I do in the tank, siphon clean the gravel, plant plants, clean the glass..., he thinks is just for his entertanement