Its like left and right, conservative and liberal, light and dark. There are things that don't have opposites because either of nutrality or some other factor but this is something else. Homophobia is the fear of homosexuals so that means heterophobia is the fear of heterosexuals and thats a fact
I've heard things like "you haven't gone through it" or "they have it so easy". To be honest it sounds like they hate people that are comfortable being who they are. I mean i respect the LGBT community, but i don"t like it when i'm labelled and assumed to be bad just because i'm straight and "cis gendered". Is it a bad thing? Well if homophobia is bad in your mind so should heterophobia.
We people of the LGBT+ aren't angry with heterosexuals for being heterosexual, we're angry because most of them look down upon us, lividly hate us, want to kill us and/or want us off the face of the earth. Heterosexuals also fail to realize they have more priveldge then us and expect more such as Hetersexual Pride which is unnecessary since throught history and 24/7 heterosexuals take up most of the earth, are more out there and seen as a norm and not some abomination that should be destroyed, don't have to 'come out' to anyone that their heterosexual, usually assume everyone else is heterosexual, most of the media is populated by heterosexuals. Heterosexuals(not all heterosexuals) literally hate us because they believe liking the same gender or being transgender is sinful and should be punished, or they believe liking the same gender or being transgender are not what mother nature had in mind and therefore we are seen as abnormal people, menaces to society, or abominations. In a sense Heterophobia could be real but that'd be only in times of fear for our lives as we are literally targeted, hunted down and harmed and killed intentionally. Homophobia goes beyond just hating and/or disagreeing with SGA, we are denied a lot of things and get a lot of thing taken from us, such as public bathrooms for our gender, weddings and wedding cakes, jobs , etc. We are killed and harmed because we don't follow 'God's' way or we aren't 'normal' or what nature 'created'. Most of us LGBT+ are in the closet because we fear for our safety from mainly heterosexuals and cis gendered people. I'm sorry if you receive hate or are feared for being heterosexual but your own people are the ones who made it this way. Heterophobia is not real, heterosexuals are literally the face of the earth and the most privileged.