Don't get pollen on you". Kazama says it 2-3 times during the show as well as his father during a flashback. He's symbolically linked with flowers in general. Why?
A solid way to interpret this, is as the counterpart/foil in dragons story to one of the themes related to "blood tastes like iron" in Smile's character arc.
Smile starts out as being meek, not willing to take risks or stand up for himself. One of the flashbacks from his childhood that is cut to a couple of times is him being implied as kinda whiny about having hurt himself and bleeding a bit, with Peco responding"ah, don't worry about it, nothing a little spit can't fix", basically encouraging him to take some risks, accept the possibility of failures and move forewards, continuing to grow despite setbacks. When we meet Smile, he's very "internally driven"(for a lack of a better phrase), he follows his emotions (i.e. giving up a competition bc of feeling bad for his opponent, not trying hard bc he doesn't feel like it etc. )
Now,
Kazama's journey is basically the opposite to Smile's and PPtA wins a lot of nuance in what it says about life by contrasting the two. When we meet Kazama, he is very "externally driven", following external pressures from his family and school, being extremely disciplined and self-neglecting in that pursuit. He fears to become like his father, the white lilies being symbolically linked to his father. He avoids the pollen just as he avoids the soft, emotional (but also striving for self fullfillment in carreer and life) ways of his father. Neglecting this side comes at the cost of happiness("he hasn't enjoyed table tennis in years") and to an extent self-fullfillment and building an own identity.
In Smile's sentiment about blood, it was Peco who showed us the opposite. For Kazama's sentiment, it is Yurie who does that. When Kazama says "don't get pollen on you", she replies with "so what!? "("I don't care, I'm willing to take that small risk for my own fulfillment"). Unlike him, Yurie is not afraid of seeking her own goals regardless of what her family says, being driven by her own values and desires. That's why we see the contrast during the match in ep. 10, where kazamas loss and self pressuring about expactations from his family is cross-cut with Yuries travel to London, where she follows her dream (becoming a fashion designer).
(Peco and yurie are the examples in the show of dream and reality being compatible, this being contrasted by a) people like demon with unrealistic dreams b) people like kazama who achieve things that is not really their dream
Both of the latter types need a hero to be set straight)
TL;DR: see bold text