Without supporting evidence, it looks way too much like claiming credit for and expertise in everything any of your friends or coworkers has ever done. The chance of one person doing production grade work on all of those things is quite small. Tell me which of those you're expert in, and which of those you're familiar with because it was used around your specialty and you had opportunity dip your fingers in. Even your shorter list - while being more believable - would have me asking questions about your strengths at each layer of "full stack" you're claiming. Every great fullstack dev I've met has been open about specialising in some part while being some degree of competent or capable in other parts.

I think it might be a red flag if that same resume only has 1 or 2 years of work experience, and the section read like the person just dumped every buzzword they could think of, even if their "experience" with said technology consisted of reading a tutorial once.

I think it means the word salad. Are you really working on a project that mixes Python, Java, C# and C?

On the flip side of the coin, this word salad appears on many job posts. It would be nice to see them clearly define their stack but also other languages they accept on a separate line.

If you say that you created a web based app which did X using JQuery and C# with a MySQL back end most people would know that you used those technologies.