A conservative YouTuber challenging Rep. Tony Gonzales (R-TX) — whom he accuses of being insufficiently far right — could soon face serious backlash from the MAGA base over newly surfaced insults he levied against former President Donald Trump’s teenage son. The Daily Beast reported Monday night that GOP challenger Brandon Herrera last month relentlessly mocked Trump’s 17-year-old son Barron. A co-host of Herrera’s podcast, from February, can be heard demeaning Barron as a “long ventriloquist-like dummy” who looked like “Slenderman” and being the new “cryptid”— a fabled creature akin to Bigfoo…