She went on to say that being "right" isn't true as often as one thinks, and in any case, forcing your "rightness" on others can sometimes exclude you from groups, opportunities, and experiences, which takes away happiness. Being happy doesn't mean abandoning your principals, either. It means knowing when it's worth picking a battle versus letting something go because you may, in fact, be wrong according to those in the know, and in any case, when principals aren't involved, it's often easier to simply let it go.
This is all a polite way of suggesting what another might say in three semi-rude words, and that I'll only repeat here to potentially prevent someone else from being abrasive, not because I mean too say them directly myself: "get over it."
As for it looking childish...I suppose that's a matter of opinion, but I have to wonder if you also consider people who call Apple Macintosh computers "Macs" to be childish as well? My point being, even the folks at the Raspberry Pi Foundation use the common shorthand sometimes. If they are okay with it, I'm okay with it.
That said, we interchangeably use rpi, raspi and raspberry pi at work. A web search for raspi confirms it's quite a common pattern for the board.
I even have a 'raspi' motor hat on one of my robots, the "raspirobotboard v2" https://github.com/simonmonk/raspirobotboard2