So first of all, the original post is pretty straightforwardly a classic trolling attempt. You made no real attempt to discuss the article you were posting (if you even read it), to give your own opinion on it, or to solicit other people's opinions on it. Instead, you used a snarky, rage-baiting title that posits a strawman position and was meant to antagonize, not to seek discussion or debate. Then, in this follow-up post, you made clear that this post is just some sort of gotcha based on the fact that you were supposedly told years ago that you were racist because of something something border wall. In other words, this is just some vague airing of grievances in which you apparently expect us to remember verbatim, take responsibility for, and apologize for unidentified posts by unidentified posters made years ago. How exactly are we supposed to do that?
Second, you are misconstruing (probably unintentionally) the intersection of "racist" and "border wall." Trump's 2016 stump speeches railing on the border wall were typical dog-whistling meant to stoke simmering racist, nativist, and anti-immigrant sentiment and drive white voters to the polls based on fear and hate (it worked!). That doesn't mean everyone who supports a border wall is racist, or that the wall itself is racist, but it does mean that the border wall (as the icon of Trump's immigration policy collectively) became a rallying cry for people looking for an acceptable way to express racist and/or anti-immigrant sentiment that was not considered socially acceptable to voice out loud. In that sense it's much the same as Fox News' periodic fearmongering about a MIGRANT CARAVAN or the people (including Trump) who describe the border situation by calling it an INVASION (both of which are transparently ridiculous).
if you have any thoughts on the bipartisan border bill or Harris's position, feel free to actually post them for discussion. But the idea that Harris now supports Trump's border wall is silly - the bipartisan border bill calls for a fraction of the funding and a fraction of the scope of Trump's inane idea to line the entire southern border with a wall.