Dialogues in Tamil movies that contradict with the movie.

Yaaradi Nee Mohini... I watched this movie today with my parents and my sister's in-laws. Since I was going to be with them only for 3 days I thought of just ling around doing nothing and spend the whole day in the couch. The movie was a USUAL one, love story (not any new experiment like 23rd Pulikesi). But there was this one line that the young character Vaasu (Dhanush) says which was totally weird. He says, "idhu enna business-nu nenachikittu irukkiya? Vaazhkai di, (snapping his fingers) ippideenrathukkulla odi poidum" when Nayanthara (I forgot her character's name) tells him that she loves him just the night before her marriage with Cheenu, Vasu's close friend. Do you guys see anything weird in it? I don't know about you but I do. He says to her that business decisions are harder take longer time than a decision regarding your life and spouse. Studying his response to the girl's request, it seems like he has considered life's most vital decision (choosing your spouse) a simple 3 minute thought just because life's too short (of course, don't businesses last longer than an average person's life time?). He wanted her to make a decision righ there when he proposed to him instead of taking some time to think (which anyone in business would do) about other things like talking to your parents etc. I dunno why, but this is the only thing that caught my attention among other flaws like Vaasu completing a big software project in one night's time without even knowing how to read english properly, Vaasu's reaction/behaviour/rowdy attitude towards Nayanthaara's thatha when he finally tells everyone about his involvement with Nayanthaara and still talking to the old man with respect later and a few more.