ok first thing a straight pride parade sounds awful. i don't see that being a fun party. maybe i am wrong.

second there is nothing inherently wrong with straight pride or white pride.

third and this is where the meat is I would ask why do you feel the need to publicly and loudly shout your pride? Do you feel your very identity being physically and socially threatened on a daily basis? So much so that you have to go to "Straight Clubs" in order to express affection for your significant other? There is no history of people being killed for being straight. No history of people being kicked out, disowned, or bullied for it. heterosexual marriage have been accepted as long as there has been marriage, with out exception.
So to the people who celebrate heterosexual pride i sincerely ask; Is the only reason you want to celebrate it because gay people celebrate gay pride? Did you see a space carved out in blood by another demographic and demand that you also be privy to it? Is it out of spite that "all these gays get to shove who they are in my face?"
Because if the reason is anything other than a deep feeling of passion and camaraderie with other heterosexuals, than you are being a jerk.
And if you just want a party, you are more than welcome to join us in Pride month. We have drinks and snacks.

Just something for individuals to chew on. i make no judgements on anyone.