Now...from a story standpoint...you have to ask, how we get to that point, and then why we might use this or any stat and have Tails get angry anyway. I like to think I gave a new reason/type of anger in the replacement for the dark pool scene which leaves the door open for more and different content that is both in my brain and been part of the discussion by the community. But..even if that's not the case...if it is true..."you're a bad man/babysitter"...their dialogue/interaction where hes asking about inappropriate touches and stuff, and then cream is not denying that, and then sonic barges in to obviously interrupt him getting the answer...and giving an "'ll kill you look" about this discussion...he has a lot of reason to believe something nefarious is afoot and thus, arguably be angry.
My problem with that scene is basically, why does Tails ask it of Cream in the first place? Then I though about the whole "sex epidemic" plot and had some ideas for that scene:
1) Less than 200 RWC - neutral result, Tails questions Sonic's competency and that's about it.
2) -6 or lower moral alignment - Sonic is a bad babysitter, Tails is rightly pissed.
3) More than 200 RWC, Cream not naked - gives up to four options:
3.1) Give a non-answer - same as it is now, Tails is suspicious and storms off.
3.2) Have Sonic explode on him - Sonic tells Tails off for his paranoia and tells him to get out. Tails is ashamed, Sonic is pissed and will refuse to call Tails for the rest of the week (same result as 1, but with different dialogue if you try to call Tails).
3.3) Question Tails about the sex epidemic - only available if you learned about it from Amy or Sally - Sonic asks if Tails' questions to Cream were due to the whole "everyone wants sex" thing. How it proceeds is up to you, but it's the best result.
3.4) Ask Tails if he is jealous - only available if you've seen Tails aroused due to Cream swimming in a pool in a shirt - Sonic jokingly asks Tails if he is jealous, Tails awkwardly shuts up, Sonic goes "You're kidding me". Might lead to Cream x Tails sex or even Cream x Tails x Sonic threesome later on.
4) Cream is naked - She gives a non-answer, Sonic gives his "I'm gonna kill you" glare, Tails is angry unless you've seen options 3.3 or 3.4. In the first, he asks Sonic "are you
absolutely sure the sex epidemic did not affect you", which depending on answer can lead to him being angry and storming off, or just leaving. In the second, he is confused and aroused..
Speaking of the pool, I think the option to have Cream swim in a shirt should just be a third option, not reliant on not having Cream naked.