No. It only would get narcissistic if you had a choir of minions to dance
around you singing your praises while you rode in.
If you don't go overboard on the T-shirt and avoid the scrolling leds on
the sleeves which can be programmed to display the almost infinite number
of ways that the owner is so awesome you should be fine.
Remember, let the bike do the talking. A mobile spotlight setup to highlight
the machine while the minions frolic reverently around it doesn't project the
same level of personal ostentation.