Less quercetin might increase the ease of bruising, so, less citrus consumption might do that.
But generally speakking I don't know.
In my own case the two dietary changes that I guessed might have been responsible for greatly decreased bruising were increased fish oil and increased flavonoids, polyphenols and so forth.
It could well be that in my case the fish oil had nothing to do with my decreased incidence of bruising and it was only increased phytonutritents; or it was something else entirely; or even that maybe increased fish oil would have worsened it some but other factors improved resistance even more.
Dunno. But anyway I now do not bruise easily whereas for a very long time I had.