The claim stated above is true. While in moderation redbulls can be a good boost of caffeine, the overall health risks outweigh the positives. There's a range of both mental and physical detriments that arise when consuming energy drinks in general.
Cleveland Clinic posted an article in 2024 titled "Are Energy Drinks Bad For You?". In the article, they state that an 8 oz can of redbull has about 85mg of caffeine, which is comparable to a cup of coffee that has about 90mg of caffeine. With that being said, the combination of other ingredients(taurine, ginseng, amino acids, etc) with the caffeine and added sugar have detrimental effects. The list of side effects is lengthy, including: increased blood sugar, anxiety, depression, headaches, diarrhea, mood swings, nausea, rapid heart rate, and many more.
The article also mentions that the "jittery" feeling you get after drinking energy drinks is not uncommon. However, drinking an excessive amount of energy drinks can lead to heart problems, and even stroke. High blood pressure is the leading risk for stroke, as the article states, and rebulls/energy drinks can be a major factor in an increase in blood pressure.
At the end of the article, the author states that energy drinks in general should not be mixed with alcohol and medications, as they can either enhance or reduce the effects of both substances which can be dangerous. Also, the article states that certain groups(like children and pregnant women, for example) are more vulnerable to the effects of energy drinks and should avoid them completely. There's a variety of healthier alternatives that don't have so many harmful side effects.
https://health.clevelandclinic.org/are-energy-drinks-bad-for-you