Had you said it was about 2.5% for the last year, I would have said nothing. But you said: "Inflation rate for the last 2 years has been running at about 2.5 percent." when in fact for one of those years, it was 4.1%.
Had you just said, "my mistake" or some-such, I would have apologized, but you didn't, you just doubled-down on the lie and attacked me for calling you out on it.