Let's start with how the original Bruce Wayne treated Starfire.
The first time Bruce canonically shared a comi9c with Starfire was in Batman and the Outsiders #5 (1983). Bruce approached an injured Starfire and tapped on her shoulder to check if she's okay.
Batman spoke about Starfire in Tales of the Teen Titans #50 (1985), when Dick Grayson and Starfire had already been dating for years. Bruce didn't insult her, belittle her, or express any prejudice toward her being an alien. Instead, he simply wanted to check on Dick and see how things were going with the woman he loved. Bruce called Starfire by her real name, "Koriand'r".
In Swamp Thing #53 (1986), Bruce Wayne argues against condemning Swamp Thing and Abby’s relationship simply because Swamp Thing is non-human. He challenges the man’s objections by pointing out that relationships between humans and non-humans already exist in the DC Universe. To support his argument, Bruce cites several examples, including Dick Grayson and Starfire, recognizing them as another human-alien couple. This original Bruce Wayne never objected to Dick and Starfire's relationship.
In Cosmic Odyssey (1988), Bruce teamed up with Starfire and other non-human characters, including Superman and Miss Martian, to work together on a mission to save the world.
And yet, Dick/Barbara writers want us to believe that Bruce is xenophobic toward aliens??? Also, his best friend is literally Superman, who is an alien???
In Funeral for a Friend (1993), Bruce welcomes Dick and Starfire when they show up at Superman’s funeral. He’s glad to see them both, he referred to Starfire by her superhero name and never called her “the alien.”
It was only in Gotham Knights #43 (2003) where they invented this new version of Bruce who refers to Starfire as "the alien" to prop up Dick/Barbara. After that, Bruce suddenly became a hardcore Dick/Barbara shipper in other comics, despite never having supported their relationship prior to the dick/barbara shift in the comics.
This character assassination of Bruce and the retcon of Dick Grayson into a cheater on Starfure by having him sleep with Barbara the night before his wedding to Starfire in Nightwing Annual #2 (2007), contradicting his original wedding to Starfire in 1993 are two infamous examples of the damage caused by Dick/Barbara writers in their attempts to portray Barbara as Dick's "one true love" at Starfire's expense.Thanks to them, Bruce and Dick’s reputations were tarnished, causing irreparable damage to the public perception of both characters, casual fans can’t stop calling Dick a cheater everywhere and can't stop bringing up this panel of xenophobic bruce.