The problem here is not whether or not your are scrupulous.
You appear to lack respect for your father. It’s not easy caring for children who are not really appreciative and think they already are grown up and knowledgeable about everything. Apologize for your cursing and try not to be so critical.
You life is only beginning. It’s hard enough. It will be an even harder road if you think you are superior and are critical of everyone around you.
Pray for patience. Pray to Our Lady for humility. Pray for your parents.
Weeeellll it didn’t sound to me that Johnny did this out od a lack of respect for his father.
I have been in similar doubts, and I really do not trust myself enough to say whether or not this was sinful or not, and if yes, how severely so.
I just had to come to Johnny’s defense here saying it didn’t sound like he did it out of disrespect. But then again, how do I know this… I do not.
If we can always be in a state of love and understanding and love those around us with all their little particularities and noises and behaviors and habits and smells… that would be wonderful.
When we are in a bad mood (nervous about something, don’t feel well, tired…), that can affect our ability to be kind and loving and patient with our neighbors and family members.
Samo es when standing in line somehwere, ahving to wait… if we are already nervous becuase of something else, we are more likely to get impatient, maybe make a suppressed remark like “move it, man…”

Which is NOT GOOD and should be avoided…
It helps to remember the love of God and everything we must be thankful for!! Oh and there is sooo much of it… really so much that such small annoyances should not make us “bitchy”, but then again, we are human…
Definitely the F word should not be used. This is often a habit, using that word, and can be un-learned

.
Definitely parents need to be respected.
Definitely we should try to be patient and loving with our neighbors.
Where does sin start? Often I wonder.
If I am nervous and yell at somebody out of frustration, I THINK that would not be a mortal sin, but often I have been unsure myself.
Sorry I can’t help more, just some thoughts.