Qwerty,
Shulchan Aruch:
עָוֹן גָּדוֹל הוּא לְבַזּוֹת תַּלְמִידֵי חֲכָמִים אוֹ לִשְׂנאוֹתָן. לֹא חָרְבָה יְרוּשָׁלַיִם, עַד שֶׁבִּזּוּ בָהּ תַּלְמִידֵי חֲכָמִים, שֶׁנֶּאֱמַר, וַיִהְיוּ מַלְעִיבִים בְּמַלְאֲכֵי הָאֱלֹהִים וּבוֹזִים דְּבָרָיו וּמִתַּעְתְּעִים בִּנְבִיאָיו, כְּלוֹמַר, בּוֹזִים מְלַמְּדֵי דְבָרָיו. וְכֵן זֶה שֶׁאָמְרָה תוֹרָה, וְאִם בְּחֻקֹּתַי תִּמְאָסוּ, מְלַמְּדֵי חֻקּוֹתַי תִּמְאָסוּ. וְכָל הַמְבַזֶּה אֶת הַחֲכָמִים, אֵין לוֹ חֵלֶק לָעוֹלָם הַבָּא, וְהוּא בִּכְלַל כִּי דְבַר ה’ בָּזָה. וְאָסוּר לְשַׁמֵּשׁ בְּמִי שֶהוּא שׁוֹנֶה הֲלָכוֹת.
It is a great sin to disgrace or hate Torah scholars. Jerusalem was not destroyed until its people disgraced the Torah scholars, as it says: “They mocked the messengers of G-d, despised His words, and scoffed at His prophets”, meaning they scorned those who taught His words. Similarly, when the Torah says, “If you despise My statutes”, it means you despise those who teach My statutes. Anyone who disgraces Torah scholars has no share in the World to Come, and is included in the verse, “For he has despised the word of G-d”. It is forbidden to serve someone who studies halachot.